The graphical user interface > Circuit Objects > Customizing Components > Line/Cable Dialog

Supported only with "Internal calculation" checked.

The user must select NumPhases action before import with three possibilities:

•The imported file determines the number of phases.

•The model as specified above determines the number of phases and the matrices in the file are either reduced (normal case, conductors above NumPhases given by model are assumed to be on ground potential carrying current) or

•ignored (the conductors above NumPhases are assumed to be on ground potential carrying zero current (same as segmented ground in Line Constants)).

The following (case sensitive) XML-format is defined:

0.001+0.001i, 0.001+0.001i, 0.001+0.001i

</Z>

0.1+0.1i, 0.1+0.1i, 0.1+0.1i

</Z>

//Etc. in increasing order of frequency.

//Typically 3 points per decade are needed in the frequency range of interest.

0.1e-6, -0.01e-6, -0.01e-6

-0.01e-6, 0.1e-6, -0.1+0.1

-0.01e-6, -0.01e-6, 0.1e-6

</Y>

</ZY>

The property ZFMt can be ["R+Xi", "R+iX", "R+Xj", "R+jX"],

The property YFmt can be ["C", "G+Bi", "G+iB", "G+Bj", "G+jB"].

With YFmt=C" the (Maxwell) capacitance is given in Farad, frequency does not matter in this case.

The frequency points must be the same for Z and Y (unless YFMt="C" is used).

Length="1" means data per meter length.

The values for Z and Y are shown on the Data page and plots under View.

The models PI, Bergeron, JMarti and ULM can be selected. JMarti and ULM will require Z and Y given at selected points in the frequency range of interest. This would also be needed for PI and Bergeron unless the exact desired frequency point is provided. Vector Fitting is used to approximate the elements in Z and Y with rational functions sum(c/(s-a))+d for resampling.

Matrix Import

Matrix Import